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Infrasonic Observations of Meteoroids: Preliminary Results from a Coordinated Optical-radar-infrasound Observing Campaign |
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| Authors: | Wayne N Edwards Peter G Brown Robert J Weryk Douglas O ReVelle |
| Institution: | (1) Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street, London, ON, Canada, N6A 5B7;(2) Department of Physics and Astronomy, University of Western Ontario, 1151 Richmond Street, London, ON, Canada, N6A 3K7;(3) Atmospheric, Climate and Environmental Dynamics, Meteorological Modeling Team, Los Alamos National Laboratory, MS D401, P.O. Box 1663, Los Alamos, NM 87545, USA |
| Abstract: | Recent observations using the newly installed Elginfield infrasound array in coordination with the Southern Ontario all-sky meteor camera network and Canadian Meteor Orbit Radar (CMOR) has shown that the number of meteors producing infrasound at the Earth’s surface is more frequent than previously thought. These data show the flux of meteoroids capable of producing infrasound at the ground is at least 1/month and is limited to meteors with peak visual brightness above −2. Comparisons to current meteor infrasound theory show excellent agreement with amplitude and period predictions for weakly non-linear shock waves using a realistic vertically inhomogeneous atmosphere. Similar predictions show isothermal assumptions underestimate the amplitude by orders of magnitude. |
| Keywords: | Atmosphere Infrasound Meteor Meteoroid Shock waves |
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